1 Answer
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Not sure which versions you used? I was able to reproduce your problem in FME Desktop 2018.0.0.1 / QGIS Desktop 3.0.2

This behavior is likely to be caused by nested aggregates, created by the Aggregator as the source features already containes aggregates. For example the feature with idobj d3a4eed9-e042-4689-b050-d42c6bf6f248 is an aggregate from 2 areas.